that was a moment at which they brought in more technology. essentially a robotic arm which reached in and started tearing away at the fabric and trying to get a better look in the boat even as they were calling out with a bull horn saying you need to surrender. finally around 8:00 they brought back in the thermal device and this time as it flew over, this is what it saw. inside the boat, the man was completely down now. his feet are this way. you can see at the other end is his head. by this point authorities were convinced that he really was ready to surrender and in fact had no strength to fight back anymore. they made him stand up and show he had no bombs on him. and finally took him into custody. >> it was technology, there was community assistance and old-fashioned police work at play. three people died in the bombing here at the boston marathon and more than 170 people suffered injuries. just narrowly escaping a worse fate. 57 are still in boston hospitals. >> now a new patient joins the bomber, dzhokhar tsarnaev. officials say he's sed